1. Earthquakes

2. Key terms Stress- the forces acting on an area
Strain- the deformation of materials in response to stress
Fault- fracture or system of fractures along which movement occurs
Focus- point where earthquake originates
Epicenter- point on Earth’s surface above the focus

3. Stress and strain Compression- stress pressing inwards
Tension- stress pressing outwards
Shear- twisting of
material

4. Types of faults
Normal fault- fractures by horizontal tension

5. Reverse fault
Caused due to compression stress

6. Strike slip fault
Caused due to shear stress

7. San Andreas Fault

8. Parts of the Earthquake

9. Types of waves P-Wave
Primary waves squeeze rocks in the same direction along which they are traveling

10. S- wave
Secondary waves will cause the rock to move at right angles along the wave Both the p and s wave move along the interior

11. Surface wave
Moves rock along the surface in 2 directions. Up and down and side to side